Bump RC to 4

include/storage/shared_monitor.hpp

@@ -117,6 +117,19 @@ template <typename Data> struct SharedMonitor
 #endif
 
     static void remove() { bi::shared_memory_object::remove(Data::name); }
+    static bool exists()
+    {
+        try
+        {
+            bi::shared_memory_object shmem_open =
+                bi::shared_memory_object(bi::open_only, Data::name, bi::read_only);
+        }
+        catch (const bi::interprocess_exception &exception)
+        {
+            return false;
+        }
+        return true;
+    }
 
   private:
 #if USE_BOOST_INTERPROCESS_CONDITION

package.json

@@ -1,6 +1,6 @@
 {
   "name": "osrm",
-  "version": "5.17.0-rc.3",
+  "version": "5.17.0-rc.4",
   "private": false,
   "description": "The Open Source Routing Machine is a high performance routing engine written in C++14 designed to run on OpenStreetMap data.",
   "dependencies": {

src/tools/store.cpp

@@ -27,12 +27,15 @@ void deleteRegion(const storage::SharedRegionRegister::ShmKey key)
 
 void listRegions()
 {
-
+    osrm::util::Log() << "name\tshm key\ttimestamp\tsize";
+    if (!storage::SharedMonitor<storage::SharedRegionRegister>::exists())
+    {
+        return;
+    }
     storage::SharedMonitor<storage::SharedRegionRegister> monitor;
     std::vector<std::string> names;
     const auto &shared_register = monitor.data();
     shared_register.List(std::back_inserter(names));
-    osrm::util::Log() << "name\tshm key\ttimestamp\tsize";
     for (const auto &name : names)
     {
         auto id = shared_register.Find(name);
@@ -105,8 +108,7 @@ bool generateDataStoreOptions(const int argc,
          boost::program_options::value<bool>(&list_datasets)
              ->default_value(false)
              ->implicit_value(true),
-         "Name of the dataset to load into memory. This allows having multiple datasets in memory "
-         "at the same time.") //
+         "List all OSRM datasets currently in memory") //
         ("only-metric",
          boost::program_options::value<bool>(&only_metric)
              ->default_value(false)